Structural evolution of an alkali sulfate activated slag cement

Mobasher, Neda; Bernal, Susan A.; Provis, John L.

doi:10.1016/j.jnucmat.2015.11.016

Cited by 139 publications

(86 citation statements)

References 37 publications

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“…Without the GO, the typical rocklike hydration products mainly consist of C-(A)-S-H gel together with the remaining slag particles (lighter and angular part of Fig. 5a), which is similar to previous findings [30][31][32][33][34][35]. At a GO dosage of 0.01 wt.…”

Section: Microstructural Investigationssupporting

confidence: 90%

“…6). The chemical analysis results show that calcium, silicon, aluminium and magnesium were the main elements in the rhombohedral symmetry, which is similar to the hydrotalcite-like LDH products in AAS pastes reported by Mobasher et al [30]. Fig.…”

Section: Microstructural Investigationssupporting

confidence: 82%

“…7 illustrates the XRD analysis of AAS pastes with various contents of GO after 28 days curing at 20 °C. A main wide and disperse peak at 29˚ was identified as the main hydration product C-(A)-S-H gel in the AAS pastes, as was widely reported and verified in recent studies [12,[30][31][32][33][34][35]. A relatively lower-intensity peak at approximately 11˚ 2 was also found in all of the samples, which can be attributed to the formation of an LDH phase [30][31][36][37].…”

Section: Microstructural Investigationssupporting

confidence: 81%

“…5b-c, which is similar to the morphology of synthetic layered double hydroxides (LDHs) discovered by previous studies [36][37]. LDHs, which often appear as hydrotalcite or other variants in AAS, are well known as one of the main hydration products when magnesium is present [30][31][32][33]. This has been investigated using XRD, SEM-EDS and MAS NMR methods on AAS pastes.…”

Section: Microstructural Investigationssupporting

confidence: 70%

“…This has been investigated using XRD, SEM-EDS and MAS NMR methods on AAS pastes. Furthermore, no obvious crystal structure of LDHs was found in the previous studies [30][31]33], except using the micro-9 reactor approach [35], which was carried out using FIB/SEM. When the GO dosage was 0.03 wt.…”

Section: Microstructural Investigationsmentioning

confidence: 88%

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Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

Zhu

Kang

Yang

et al. 2017

Construction and Building Materials

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Highlights:(1) Graphene Oxide (GO) caused a significant reduction in fluidity and a slight decrease in compressive strength of AAS mortars.(2) The flexural strength of hardened mortars were improved by adding GO.(3) Layered double hydroxides (LDHs) were observed and confirmed in GO-added AAS system. AbstractDue to its high aspect ratio and outstanding tensile strength, graphene oxide (GO) can dramatically reduce the brittleness of cement-based materials. In this paper, GO nanosheets were successfully synthesised using the modified Hummers' method. Effects of the GO on the fluidity, mechanical properties of alkali-activated slag (AAS) mortars and the microstructure of the AAS pastes were studied.It is found that addition of the GO caused a significant reduction in fluidity and a slight decrease in the compressive strength of the hardened mortars. However, the GO improved the flexural strengths by 20% with a dosage of 0.01 wt. % after 7 days. Large-scale layered double hydroxides (LDHs) were observed using SEM, the compositions of which were identified and EDS and XRD. A possible mechanism of the formation of LDHs in the GO-AAS system is proposed. Due to the Mg 2+ /Al 3+ decomposed from the slag and the Al(OH)4 -formed in the high pH condition in the GO-AAS system, the reaction pathway of LDHs 2 can be regarded as a , This research provides a further understanding of the effect of graphene oxide which has a potential application of GO in AASC.

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